Title :
Planar near-field scanning in the time domain .1. Formulation
Author :
Hansen, Thorkild B. ; Yaghjian, Arthur D.
Author_Institution :
Rome Lab. ECRT, Hanscom AFB, MA, USA
fDate :
9/1/1994 12:00:00 AM
Abstract :
Time-domain planar near-field measurement techniques are formulated for acoustic and electromagnetic fields. Probe correction is ignored in that it is assumed that the probe measures the exact values of the field on the scan plane. Two fundamentally different approaches are used in deriving three sets of formulas that give the fields in the source-free half space z>z0 in terms of their values on the scan plane z=z0. In the first approach the time-domain formulas are obtained by inverse Fourier transforming the corresponding frequency-domain formulas. In the second approach the time-domain formulas are derived directly in the time domain by working with time-domain Green´s functions
Keywords :
Green´s function methods; acoustic field; acoustic variables measurement; antenna radiation patterns; antenna testing; electromagnetic fields; time-domain analysis; acoustic fields; electromagnetic fields; frequency-domain formulas; inverse Fourier transform; planar near-field measurement; planar near-field scanning; source-free half space; time-domain Green´s functions; time-domain formulas; time-domain measurement techniques; Acoustic measurements; Acoustic scattering; Antenna measurements; Electromagnetic fields; Electromagnetic measurements; Electromagnetic scattering; Near-field radiation pattern; Probes; Radar scattering; Time domain analysis;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
